What yarns do you use in applique?

There are different types of applique.

One type of applique involves sewing a small shape of fabric, such as a flower, onto another piece of fabric. Some quilts are made this way, and applique is also sometimes used on garments. In this case, you do not use "yarn", but thread. You may applique (sew) the piece on by hand, or by machine. In some cases, people use embroidery floss and sew a button-hole stitch or other decorative stitch around the applique.

In some cases, you might consider certain types of crocheted decorations to be applique. An example of this might be when you crochet an animal-shape and then attach it to a crocheted baby afghan. In this case, you would probably use the same yarn with which you crocheted the animal or other shape.

I hope this helps you.